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Dissipation de l’énergie mécanique dans les assemblages : effet du frottement en sollicitation dynamique

Abstract : This thesis presents a study of damping in assembled structures, or, more precisely, a study of the vibrations of assemblies under external excitations. The paper contains five chapters examining this problem from both analytical and experimental viewpoints. An academic investigation is presented as a foundation in order to study assemblies both under constant normal stresses (static), and under tangential stresses linked to the structural vibrations (dynamic). The loss factor that characterizes the damping of the structure is obtained through a quasi-static local study. Then, a dissipation function is given, which allows the refinement of the damping model through a global dynamic study. An experimental analysis is undertaken to examine the results obtained by the modeling. The objective of this analysis is to isolate the effects, at the structural damping, of partial sliding in the assemblies. To isolate these effects, two structures identical in shape and material, one assembled and one uniform, are studied. The data collected from the interfaces are analyzed, and then compared to the analytical results. In order to simulate these effects with greater precision, a modeling is undertaken that takes into account the defects of form for the surfaces in contact
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https://pastel.archives-ouvertes.fr/pastel-00749730
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Submitted on : Thursday, November 8, 2012 - 11:37:14 AM
Last modification on : Friday, July 17, 2020 - 5:08:35 PM
Long-term archiving on: : Saturday, February 9, 2013 - 3:43:07 AM

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TH2012PEST1052_complete.pdf
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  • HAL Id : pastel-00749730, version 1

Citation

Nicolas Peyret. Dissipation de l’énergie mécanique dans les assemblages : effet du frottement en sollicitation dynamique. Mécanique [physics.med-ph]. Université Paris-Est, 2012. Français. ⟨NNT : 2012PEST1052⟩. ⟨pastel-00749730⟩

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